DETECTIVES have seized a knife and sent it for forensic examination as they continue to question a man over the alleged road rage murder of a great-grandfather who had just been given the all-clear from cancer.

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Officers have been urgently making enquiries overnight to trace the suspect

Detective Chief Inspector Karen Mizzi

His grandson, Ashley Goodlad posted on Facebook: "He was the kindest, softest and most generous man you would ever wish to meet.

"It's just confusing right now just trying to work out an answer for why this has happened."

Mr Lock had been a popular member of Worthing Excelsior Cycling Club for around 50 years.

Police say Mr Lock got out of his car and was then confronted by the driver of the car in front, who stabbed him repeatedly before getting back into his car and driving off.

An air ambulance landed and paramedics battled to save the Mr Lock's life, but he was pronounced dead at the roadside after suffering multiple stab wounds.

A spokesman for Sussex Police confirmed that detectives have seized a knife and said they are not looking for anyone else in connection with Mr Lock's death. A post mortem has confirmed that the great-grandfather died as a result of stab wounds.

Detective Chief Inspector Paul Rymarz said: "Mr Lock was the victim of a violent, unprovoked attack that he had no chance to defend himself against.

"His family are devastated by his murder and are being supported by specialist officers.

"His family have requested that they are left to grieve and I would ask people to respect their wishes at such a difficult time.

"A significant number of officers are still involved with the investigation as we work to find out exactly what happened.

"This is a fast-moving operation and we are still looking for anyone with information contact us."

A section of the A24 southbound at the junction of Cross Lane, Findon, was closed whilst officers investigated.